Have had a witehead-like pimple on the right side of my tongue for almost 3 weeks ago. Exactly 3 weeks ago, I had some dental work in that place in my mouth. a couple days after that, I noticed a painful blister there, and started doing mouthwashes. It turned into this whitehead structure a week ago. It stings when it is touched, and is rather raised. Male, 59, 5 11 , 190.